CLAED8 - merge the two sets of eigenvalues together into a single sorted set

SUBROUTINE CLAED8(

K, N, QSIZ, Q, LDQ, D, RHO, CUTPNT, Z, DLAMDA, Q2, LDQ2, W, INDXP, INDX, INDXQ, PERM, GIVPTR, GIVCOL, GIVNUM, INFO )

INTEGER CUTPNT, GIVPTR, INFO, K, LDQ, LDQ2, N, QSIZ

REAL RHO

INTEGER GIVCOL( 2, * ), INDX( * ), INDXP( * ), INDXQ( * ), PERM( * )

REAL D( * ), DLAMDA( * ), GIVNUM( 2, * ), W( * ), Z( * )

COMPLEX Q( LDQ, * ), Q2( LDQ2, * )

CLAED8 merges the two sets of eigenvalues together into a single sorted set. Then it tries to deflate the size of the problem. There are two ways in which deflation can occur: when two or more eigenvalues are close together or if there is a tiny element in the Z vector. For each such occurrence the order of the related secular equation problem is reduced by one.

K (output) INTEGER

Contains the number of non-deflated eigenvalues. This is the order of the related secular equation.

N (input) INTEGER

The dimension of the symmetric tridiagonal matrix. N >= 0.

QSIZ (input) INTEGER

The dimension of the unitary matrix used to reduce the dense or band matrix to tridiagonal form. QSIZ >= N if ICOMPQ = 1.

Q (input/output) COMPLEX array, dimension (LDQ,N)

On entry, Q contains the eigenvectors of the partially solved system which has been previously updated in matrix multiplies with other partially solved eigensystems. On exit, Q contains the trailing (N-K) updated eigenvectors (those which were deflated) in its last N-K columns.

LDQ (input) INTEGER

The leading dimension of the array Q. LDQ >= max( 1, N ).

D (input/output) REAL array, dimension (N)

On entry, D contains the eigenvalues of the two submatrices to be combined. On exit, D contains the trailing (N-K) updated eigenvalues (those which were deflated) sorted into increasing order.

RHO (input/output) REAL

Contains the off diagonal element associated with the rank-1 cut which originally split the two submatrices which are now being recombined. RHO is modified during the computation to the value required by SLAED3.

CUTPNT (input) INTEGER Contains the location of the last eigenvalue in the leading sub-matrix. MIN(1,N) <= CUTPNT <= N.

Z (input) REAL array, dimension (N)

On input this vector contains the updating vector (the last row of the first sub-eigenvector matrix and the first row of the second sub-eigenvector matrix). The contents of Z are destroyed during the updating process.

DLAMDA (output) REAL array, dimension (N) Contains a copy of the first K eigenvalues which will be used by SLAED3 to form the secular equation.

Q2 (output) COMPLEX array, dimension (LDQ2,N)

If ICOMPQ = 0, Q2 is not referenced. Otherwise, Contains a copy of the first K eigenvectors which will be used by SLAED7 in a matrix multiply (SGEMM) to update the new eigenvectors.

LDQ2 (input) INTEGER

The leading dimension of the array Q2. LDQ2 >= max( 1, N ).

W (output) REAL array, dimension (N)

This will hold the first k values of the final deflation-altered z-vector and will be passed to SLAED3.

INDXP (workspace) INTEGER array, dimension (N)

This will contain the permutation used to place deflated values of D at the end of the array. On output INDXP(1:K)

points to the nondeflated D-values and INDXP(K+1:N) points to the deflated eigenvalues.

INDX (workspace) INTEGER array, dimension (N)

This will contain the permutation used to sort the contents of D into ascending order.

INDXQ (input) INTEGER array, dimension (N)

This contains the permutation which separately sorts the two sub-problems in D into ascending order. Note that elements in the second half of this permutation must first have CUTPNT added to their values in order to be accurate.

PERM (output) INTEGER array, dimension (N)

Contains the permutations (from deflation and sorting) to be applied to each eigenblock.

GIVPTR (output) INTEGER Contains the number of Givens rotations which took place in this subproblem.

GIVCOL (output) INTEGER array, dimension (2, N) Each pair of numbers indicates a pair of columns to take place in a Givens rotation.

GIVNUM (output) REAL array, dimension (2, N) Each number indicates the S value to be used in the corresponding Givens rotation.

INFO (output) INTEGER

= 0: successful exit.

< 0: if INFO = -i, the i-th argument had an illegal value.